﻿using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DianPingDataGrab
{
    /// <summary>
    /// http://www.cnblogs.com/springyangwc/archive/2011/08/12/2136498.html
    /// </summary>
    public class ExcelHelper
    {
        public static void ExportExcel(DataTable dt)
        {
            if (dt == null || dt.Rows.Count == 0) return;
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();

            if (xlApp == null)
            {
                return;
            }
            System.Globalization.CultureInfo CurrentCI = System.Threading.Thread.CurrentThread.CurrentCulture;
            System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];
            Microsoft.Office.Interop.Excel.Range range;
            long totalCount = dt.Rows.Count;
            long rowRead = 0;
            float percent = 0;
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                worksheet.Cells[1, i + 1] = dt.Columns[i].ColumnName;
                range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, i + 1];
                range.Interior.ColorIndex = 15;
                range.Font.Bold = true;
            }
            for (int r = 0; r < dt.Rows.Count; r++)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    worksheet.Cells[r + 2, i + 1] = dt.Rows[r][i].ToString();
                }
                rowRead++;
                percent = ((float)(100 * rowRead)) / totalCount;
            }
            xlApp.Visible = true;
        }

        public static void ExportExcel(string fileName, DataGridView myDGV)
        {
            if (myDGV.Rows.Count > 0)
            {
                string saveFileName = "";
                //bool fileSaved = false;
                SaveFileDialog saveDialog = new SaveFileDialog();
                saveDialog.DefaultExt = "xls";
                saveDialog.Filter = "Excel文件|*.xls";
                saveDialog.FileName = fileName;
                saveDialog.ShowDialog();
                saveFileName = saveDialog.FileName;
                if (saveFileName.IndexOf(":") < 0) return; //被点了取消
                Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
                if (xlApp == null)
                {
                    MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                    return;
                }

                Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
                Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
                Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1

                //写入标题
                for (int i = 0; i < myDGV.ColumnCount; i++)
                {
                    worksheet.Cells[1, i + 1] = myDGV.Columns[i].HeaderText;
                }
                //写入数值
                for (int r = 0; r < myDGV.Rows.Count; r++)
                {
                    for (int i = 0; i < myDGV.ColumnCount; i++)
                    {
                        worksheet.Cells[r + 2, i + 1] = myDGV.Rows[r].Cells[i].Value;
                    }
                    System.Windows.Forms.Application.DoEvents();
                }
                worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
                                                         //if (Microsoft.Office.Interop.cmbxType.Text != "Notification")
                                                         //{
                                                         //    Excel.Range rg = worksheet.get_Range(worksheet.Cells[2, 2], worksheet.Cells[ds.Tables[0].Rows.Count + 1, 2]);
                                                         //    rg.NumberFormat = "00000000";
                                                         //}

                if (saveFileName != "")
                {
                    try
                    {
                        workbook.Saved = true;
                        workbook.SaveCopyAs(saveFileName);
                        //fileSaved = true;
                    }
                    catch (Exception ex)
                    {
                        //fileSaved = false;
                        MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                    }
                }
                //else
                //{
                //    fileSaved = false;
                //}
                xlApp.Quit();
                GC.Collect();//强行销毁
                             // if (fileSaved && System.IO.File.Exists(saveFileName)) System.Diagnostics.Process.Start(saveFileName); //打开EXCEL
                MessageBox.Show($"“{fileName}”导出Excel成功", "提示", MessageBoxButtons.OK);
            }
            else
            {
                MessageBox.Show("报表为空,无表格需要导出", "提示", MessageBoxButtons.OK);
            }
        }
    }
}